Voltage-regulator.



A. POLLAK.

VOLTAGE REGULATOR.

APPLICATiON men lULY 18. 1912.

1,137,019. Patented Apr. 27, 1915.

UNITED STATES PATENT OFFICE.

ANTON POLLAK, OF PARIS, FRANCE.

VOLTAGE-REGULATOR;

Specification of Letters Patent.

Application filed July 18, 1912: Serial No. 710,234.

T all whom it may concern:

Be it known that I, ANTON PQLLAK, a subject of the King (j Hungary,residing at 7 -Avenue due Coq, Paris, in the French Reto very greatvariations of speed and consequently give a "cry variable voltage whicheven becomes m'l when the engine stops It is," however, necessary tohave a constant voltage, that is'to say to limit the voltage furnishedby the dynamo to a certain maximum independently of its increaseofspeed. As in the. various applications of the dynamos of the abovetype it is necessary-to add to them a battery of accumulators impartingthe desired voltageto the circuit when the dynamo is.-not running or isfurnishing a current iof'a lower voltagethan it is desired to'utilize,whileon the other hand they are char ed bythe dynamo when the lattergives asu cientcurrent, it is also necessary to cut out the accumulatorsautomatically when the voltage ofthe circuit falls beyond a certainamount below'wh'ich the accumulators would discharge onto thedynamo.

The'p'resnt'invention has for itsobject a system which is-very simpleand strong and is-able to withstand the most violent shocks without the.least disturbance;

-.The accompanying drawing illustrates a systemaccording to the presentinvention.

It consists broadly of a coil A, the winding of which isinfshunti'on themain circuit; This .coil A contains at its upper part a fixed core A.and at its"l'lower part a movable core A;

an ,insulating'projection a prevents the two parts ofthe core fromcoming into contact An armature B pivoted. at b with two arms ofwhichlB"is adapted to be attracted by the core Afand' prevented fromcoming into contact by. meansof the insulating stop' 1)., while the armB carries a contact?) which normallybears upon another contactb by meansof 'asprin'g C; the tension'of which is regulated by meansof a screw 0.-A-spring b limits the movement of the armature B; Y

The part B of the armature B-and the con (Facts 1) and b are interposedin the excitation circuit (shunt E of the dynamo).' A

resistance D is interposed in the excitation circuit when the twocontacts I), b are separated; when they are in engagement they shortcircuit the resistance. The movable core A of the coil A is prolonged bya rod Patented Apr..27, 191 5.

a the head a of which displaces the lever F pivoted at f and carrying acontact 7; opposite the contact f there is another con tact g carried'bya spring G the tension of which is regulated b a screw 9. The lever Fand the spring (il are interposed in the circuit supplying theaccumulators, the contacts f 9 closing this circuit.

The apparatus acts in the following m'an' ner: The various parts beingarranged in the manner described and as' shown inthe drawing, if thecoil A is excited, thecore A will approach the core A and car the leverF with it. The latter on being ifted sufficiently for a. given voltage,presses one contact against the other in accordance with.

the degree of attraction between the stationary core and the movablecore. However if the voltage of the current generated by the dynamodrops-below the limit-the two contacts are thenseparated and theaccumulators H are cut out of circuit. The small resistance R betweenthe dynamo and the accumulators acceleratesthe operationv of thisdevice. The insulating projection a prevent's, as already mentioned, thetwo cores from adhering one to the other. 1 The contact 9- is fixed onthespring G which balances the residual magnetic action of the core A Ifthe voltage produced by the dynamo I exceeds a certain limit the core Aexerts upon the armature B sufiicient attraction to overcome the actionof the spring C.

Thecontacts separate and the excitation current passes through theresistance D. The excitation then decreases and also the voltage .ofthe'circuit. The coil ceases to attract the armature B, the contactsclose and the same operations are repeated. It has already been proposedto use for regulating the voltage, coilscontaining a stationary andmovable core, but in such arrangements themovable core regulates thevoltage of the machine .while the'stationary core merely serves tointensify the actionof. theformer'core. .Ac-

cording to the present invention however the voltage is regulatedbytthelstationary core while the movable core-is capable of a twofoldaction, namely, itcloses th tacts of the switch controllingthecuttiiigin and; out of the accuninlatorslinfthe -worlt -cause theattraction of the core A, but as circuit and also influences theregulation ofv the dynamo voltage, as a separate part independently ofthe tractive spring of the oscil lating interrupter armature. By reasonof the air space the constant value'regulation is' begun later, that isat a higherivoltage,

than would otherwise be the case, so that a correspondingly increasedtractive force is exerted upon the movable core so that on the one handthe switch contact is not liable to be affected by reason ofsudden jerksor shocks and on the otherhandstrong. springs may be employed toseparate .the fixed and I movable cores even should there bea small fallin voltage.

\Vhen the speed of the dynamo I (which is of course independent of-theload itself and depends only upon the speed of the motor of the vehlcle)is above the normal speed, that is the speed at whi'chthe dynamo canmaintain the voltage notwithstanding theload, no disturbance arises atthe contact closing device. Howeverunde'r "noload the j'dynanio mayrunat a speed below the normal so that the voltage is sufficiently high' tosoon as the accumulators are switched in the ivoltage drops tosuchangextent that they are jcuc outof circuit,-and so on: =.=In thisposi- 4 between the contact '9 and the accumulators =9; sifiallresistance R 'is" i'nterposed. When tion a vibration Y of the contactsgyand; f mightarise and exert aha-rmfu'l action thereon. 1In'order toavoid this defect,' an additional 'pair of. contacts g? are arrangedandthey are directly connected with the working circuit (the accumulators.)-.while the core-A" rises the. accumulator circuitis first of all.switched'in with the dynamo (the main circuit) by the" resistance Rand" the only-then whenthe speed is not sfutliciently -highto attractthe core A even under no load. V

" What 'I claiIIi and desire to secure-by Let tersPat'ent of theUnitedfstatesis v '1. A voltage regulator"forzvai'iablespeed :{dynamoscomprising" in e'on binatiom a "switch to close, v nd open the fdynamc-61, cu'it respectivelywhen the voltage exceeds vand drops below'acer'tain limit, a 'sh'untfci'is I cuit, a, spring. controlledfascinating inter-- rupter' armature interposed. in saidand asingle.coil -.inter.posd in, another cira' "'cnit,a stationary core arrangedins andadapted'togr'egulate thedyna'rno pltage hj'the operation of said.interrupter arnia;

In s witchingofl', the load is also} ture, and a movable core likewisearranged 1n said coil and adapted to operate said switch and toinfluence the regulation of the dynamo voltage, as a separate part,independently of the spring of said oscillating interrupter armature insuch a manner that the voltage is regulated to a given value exceedingthe normal-voltage until the movable core reaches its final position.

2. A voltage regulator for variable speed dynamos comprising incombination a work circuit extending from the dynamo, a single coilarranged in shunt from said circuit and containing a fixed and a movablecore, a switch-operated by said movable core to cut accumulatorsautomatically into and out of circuit with said dynamo, said switchcomprising main contacts, an additional contact-between said maincontacts and said work circuit, and a resistance through which the workcircuit is connected with the dynamo when said switch is preliminarilyattracted and when the main contacts are in engagement, and whichresistance islshort ci'rcuited during further movement of said movablecoretoward said fixed core and when the additional contact is inoperation.

3. A voltage regulator for variable speed dynamos comprising incombination, a work circuit extending from the dynamo, a single coilarranged in shunt from said circuit and containing a fixed and a movablecore, a main res stance, an interrupter armature operated by sa1d fixedcore to throw the r'e-' tors automatically into and out" of circuit.sistance into and out of the excitation circuit under determinedconditions, a switch oper-.

with-said dynamo under determined-condi, i

- tions,.said-switch comprising main. contacts,

auxiliary contacts between saidmain contacts and said-work circuit, anda resistance through 'w'hichthe work circuit is connected with thedynamo when said switch. is pre vlimi-narily attracted and whenthejmain' 'contacts are in engagement,a n'd which resist: ance isishortcircuited-during further move- 7 ment ofsai'd-ino'vable core toward saidfixed core andwhe'n the auxiliary contact'sv are in engagement, the saidresistanceybelng cut into the-work circuit' during a given returnvmovement of said movable core and out out of circuit only during afurther retu'rn movelnentof said movable coi'e;;therebyobviating' thevibration of the main contacts by a step by'stepi switching intend Outofo en twn. In testimony whereof I aifix nly'signature presence of twowitnesses.

' ANro 'tPoLnAK.

Witnesses:

- Mmmmonn,

G'sone'n E; lnorrr.

.co i1;'rtms ;it any; obtained far. was m, by amass n -me i" m lgam,- ofradii,

manages; 11'. a.

